Probably the BB9050 Callaway ferrule would work. Even though the Apex iron is not listed on that product page, it should work. That being said, if the Apex has a colored ring on it, we do not have a collard ferrule that will work. However, we do have our standard 70PI that will work. It does not have a collar on it, but it can be used. The link to the BB9050 is below.